21029089400 has 144 divisors (see below), whose sum is σ = 53844176520. Its totient is φ = 7574944000.

The previous prime is 21029089399. The next prime is 21029089421. The reversal of 21029089400 is 498092012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 37753922 + ... + 37754478.

Almost surely, 2^21029089400 is an apocalyptic number.

21029089400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21029089400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26922088260).

21029089400 is an abundant number, since it is smaller than the sum of its proper divisors (32815087120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21029089400 is a wasteful number, since it uses less digits than its factorization.

21029089400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846 (or 706 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The spelling of 21029089400 in words is "twenty-one billion, twenty-nine million, eighty-nine thousand, four hundred".